71 duster build

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Re: 71 duster build

Post by Grumpy427 on Wed Feb 25, 2015 8:41 pm



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Re: 71 duster build

Post by Grumpy427 on Wed Feb 25, 2015 8:45 pm

The Afco springs use the B body 1" diameter polly bushings. The shackle kit uses a larger bushine than the A body kit. The car rear mount uses the smaller A body bushing. We cut the factory tube out and installed larger tubes so i can run the larger B body bushing. The shackle kit comes with some nice chrome molly sleeves to make everything move freely, i wanted to use them.

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Re: 71 duster build

Post by Woodie on Thu Feb 26, 2015 3:46 am

Looking good Grump! Schumacher conversion mounts... you will want one of theses..

http://www.engine-swaps.com/Pages/ProductsType/TorqueStraps.html

I used the conversion mounts /6 to LA with a 500hp small block, after installing the strap there was no engine movement.

Nice progress Smile

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Re: 71 duster build

Post by 69ChargerR/TSE on Thu Feb 26, 2015 5:40 am

VERY nice job there Grumpy, you should be proud !

If you don't mind me asking, where did the Lunati Cam "peak" for power with the OOTB Eddy's ?
5400 ? 5600 ?
Performer rpm Intake ?

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Re: 71 duster build

Post by Grumpy427 on Thu Feb 26, 2015 6:14 am

Here is the dyno sheet on the last pull With my K&N air filter on it. The pull prior to this showed that we lots 10 ft of torque at 2900 rpm just by adding the 14x 3 K&N filter. over the dyno airbell meter. It changed the signal to the carb and fattened it up. We dropped it another 2 jet sizes, and 12 ft of torque showed back up at 2900. So the motor is making 515 ft torque at 2900 lolol.

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Re: 71 duster build

Post by Grumpy427 on Thu Feb 26, 2015 6:16 am

The Eddy heads have 2 choices, the rpm performer with a small intake runner 210 CC and the victor heads with a 280 cc runner. I decided to stay on the small side, we could of done some work to the rpm heads, but i would of given up all that low end torque and moved the power band up. no sense reving the motor any mor than it needs to be.

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Re: 71 duster build

Post by Grumpy427 on Thu Feb 26, 2015 6:22 am

Here is one of the earlier pulls you can see the motor only used 628 cfm of air so the 750 AED carb was a good choice. We had his air bell meter on and still sorting things out.


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Re: 71 duster build

Post by 69ChargerR/TSE on Thu Feb 26, 2015 8:05 am

Grumpy427 wrote:The Eddy heads have 2 choices, the rpm performer with a small intake runner 210 CC and the victor heads with a 280 cc runner. I decided to stay on the small side, we could of done some work to the rpm heads, but i would of given up all that low end torque and moved the power band up. no sense reving the motor any mor than it needs to be.

You have built a really fine Engine there ! And I am very sure it will satisfy to no end, as the low-deck Strokers are truely fantastic Street combinations.
And granted... within Edelbrock there is indeed a product offering "Hole" between the 210CC rpm's, and the "Victors" which really lend themselves better for larger Stroker Street Combinations, or strictly Race/Track efforts.

but that said,
and because I still do this for a living in semi-retirement,(Machining/Porting/Flowing/Building BB Mopars specifically), my only intent with the following is to point out for others that professional "porting", does NOT automatically "KILL the rpm band".... nor TOTALLY ruin the Torque down low ?
All depends what someone wants ?

Different applications for everybody, for everybody tastes there are trade-offs.

From my testing.... yes, I DYNO everything I do...

Here are some examples.
I will stick with low-deck vrs High Deck Blocks, Eddy or Stealth Heads, Flat Tappet Cams of similar size Solid and Hydraulic for viable comparisons of Ported vrs NON-Ported.
More than one way to skin a cat ?

383 Block based, 3.75 Stroke
same Diamond Pistons
same Eddy Performer rpm Intake
CompCams XS282S with 244* @ .050" W/.520"Lift. Solid Flat Tappet.(NOT as fast as the Lunati)
STEALTH Heads OOTB, but because they are NOT as good as the Eddy's OOTB.... We also apply our own proprietary Valve Seat Angles, Check Guides, V/Springs Pressures, CC, wash & re-assemble.
3 hrs Total Time "invoiced" for the Head Check/Regrind before installation.
Probably basically same/same as yours, but with Stealth Heads/and slower CompCam
527.1 hp @ 5400 rpm with 554.4 Ft/Lbs @ 4300 rpm.




Now for comparison.... with OUR "Ported" Edelbrocks
Keep in mind... this is our 10 Hour Invoiced "Street ported" and "Prep for Service" Pkg @ $750 Canadian.
Albeit, this one is a 400 based "451", 17 cubes bigger but diddly difference on a 438 383 based.
Still a CompCams XS282S with 244* @ .050, .520 LiftSolid Flat Tappet
"Street" Ported Eddy's... "prep for service"
SRP Flat top Piston, comparable with the Diamond.
Old Torker "383" Intake and Holley 750
574.5 HP @ 5700 rpm with 582.7 Ft/Lbs Torque @ 4400 rpm.... and still over 500 ft/lbs down at 3,500 rpm.



And now for another 'example" of the benefits of some mild "Porting"
a .030" over regular old 440 Engine(cheaper to build)
stock "ly" Rods W/ARP Bolts
ICON Flat Tops
Performer rpm Intake.
Ported STEALTHS.... again the same 10 hr "Prep for Service/Porting Pkg"
But using a "run of the mill" CompCams Flat Tappet Hydraulic Cam, the XE284H
546 HP @ 5500 rpm with 563 @ 3800 rpm



And for comparison with the above 440 based Hydraulic Cam, here is another .030" over 'el cheapo 440 using the same XE284H Hydraulic Flat Tappet Cam..... same/same, but this time back to the only 4 Hour Prep Pkg on the EDDY Heads.
530 HP @ 5300 rpm with 552 Ft/Lbs @ 3800 rpm

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Re: 71 duster build

Post by 69ChargerR/TSE on Thu Feb 26, 2015 8:23 am

My only point being, I think there may be a problem out there in the industry ? regarding some misconceptions about Porting ?.... and indeed the "COSTS" associated ?

Too many dorks out there are charging GUNGA BUCKS to dig pecker tracks in people's Heads that basically do diddle-squat ?
And I think with those examples out there ? where 'so and so' "paid millions" for porting.... by some supposed "guru"... who would NOT know how to turn a Flow Bench ON little-lown what it does.....and then.... oh lookee there martha... that thing is a terd !

I am NOT saying anyone should spend THOUSANDS on porting/Modifying what are obviously entry level Heads.. that would be just plain DUMB !
What I am saying.... is: and IN MY OPINION ONLY here....
1.)  ANY Head, especially the cheaper street offerings, benefit greatly from even the decent application of better Valve Angles, quick check-over, and some minor cleanup if even just a cartridge roll in the bowls, radius the Port pinch(3-4 hrs does NOT break the Bank Vrs Gains)
2.) If even more power is desired.... go NO MORE than a 6 hour Street Port Job added to the above, still somewhat OK price-wise Vrs even more gains.
After that.....
A guy should have bought BETTER Heads in the first place.

Just my opinions, sorry if I have offended anybody.

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Re: 71 duster build

Post by Grumpy427 on Thu Feb 26, 2015 8:30 am

I went in to my engine builder with a goal in mind and said tell me what you need for parts to make this happen? I wanted 500-550 streetable pumpgas power! I love a solid lifter cam on the street as well. Motor idles nice and makes 10" of vac! There are lots do ways to build and achieve power, it's all in the sum of the parts and you can mismatch parts pretty fast! I very happy with the result , and it should be a very nice engine to live with on the street! I had the most fun with my Camaro when it was a 12.00 et car, when it became a 9.60 car I hated it and sold it! I don't plan on doing that to the duster!

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Re: 71 duster build

Post by 69ChargerR/TSE on Thu Feb 26, 2015 8:54 am

Grumpy427 wrote:I went in to my engine builder with a goal in mind and said tell me what you need for parts to make this happen? I wanted 500-550 streetable pumpgas power! I love a solid lifter cam on the street as well. Motor idles nice and makes 10" of vac! There are lots do ways to build and achieve power, it's all in the sum of the parts and you can mismatch parts pretty fast! I  very happy with the result , and it should be a very nice engine to live with on the street! I had the most fun with my Camaro when it was a 12.00 et car, when it became a 9.60 car I hated it and sold it! I don't plan on doing that to the duster!

And I think you guys have done a wonderful job accomplishing your goals !
VERY NICE Engine.
You should be proud ! Very Happy


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Re: 71 duster build

Post by Grumpy427 on Mon Mar 16, 2015 3:52 pm

Picked up my 8-3/4 housing today, got the spring pads welded on. Plus buddy informs me that the housing was bent and he had to fix that. Glad he checked it for me.

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Re: 71 duster build

Post by JGL on Mon Mar 16, 2015 5:48 pm

Now you should be good to go, go and go.

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Re: 71 duster build

Post by Grumpy427 on Mon Mar 16, 2015 5:54 pm

Well i am going to get out to the garage and start going on the car now. Time to giver shit.

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Re: 71 duster build

Post by Woodie on Tue Mar 17, 2015 6:31 am

Grumpy427 wrote:Well i am going to get out to the garage and start going on the car now. Time to giver shit.

Git-R-Done!

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Re: 71 duster build

Post by 66 Dartman on Tue Mar 17, 2015 5:28 pm

Cool , Giver shit and take some pic's.

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Re: 71 duster build

Post by Grumpy427 on Mon Apr 06, 2015 9:46 am

The diffy sat in water on some guys farm, i sandblasted it and then gave it a skim coat of a fiberglass filler. i think it turned out pretty good.


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Re: 71 duster build

Post by Grumpy427 on Mon Apr 06, 2015 9:54 am

New 3.73 gear trac loc center from Dr Diff.






Last edited by Grumpy427 on Mon Apr 06, 2015 9:58 am; edited 1 time in total

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Re: 71 duster build

Post by JGL on Mon Apr 06, 2015 9:54 am

Nice...!

when complete send it to me PREPAID lol!

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Re: 71 duster build

Post by JGL on Mon Apr 06, 2015 9:56 am

Damn that looks good...even better under my car!

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Re: 71 duster build

Post by Grumpy427 on Mon Apr 06, 2015 9:58 am

There reposted pics of the center section they were way too big.lol

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Re: 71 duster build

Post by JGL on Mon Apr 06, 2015 11:27 am

Still looked good.

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Re: 71 duster build

Post by Grumpy427 on Mon Apr 06, 2015 11:58 am

Off to the graphics shop going to gat a Mopar stencil or decal made for the Diffy as well

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Re: 71 duster build

Post by JGL on Mon Apr 06, 2015 12:34 pm

Will you leave it silver or something else?

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Re: 71 duster build

Post by smoken340 on Mon Apr 06, 2015 1:26 pm

It's coming along Sheldon. Looking good.

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Re: 71 duster build

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